HP 8560E - Procedure

136 Chapter2
Adjustment Procedures: HP 3335A Source not Available
4a. IF Amplitude Adjustments
Procedure
1. Press LINE to turn the spectrum analyzer off. Remove the spectrum
analyzer cover and place the spectrum analyzer in the service
position as illustrated in Figure 2a-1. See Figure 2a-2 for adjustment
location.
2. Disconnect W29, violet coax cable, from A5J3. Connect the test cable
between A5J3 and the RF output of the HP E4421B. Press
LINE to
turn the spectrum analyzer on.
3. Set the spectrum analyzer controls as follows:
Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.7 MHz
Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .200 kHz
Reference level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .−60 dBm
Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0 dB
Log/division. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Log/division
Resolution BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .300 kHz
Video BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100 Hz
4. On the spectrum analyzer, press
MKR, CAL, and IF ADJ OFF.
5. Set the HP E4421B controls as follows:
Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.7 MHz
Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .−55 dBm
Mod On/Off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Off
6. Note the marker value. Ideally it should read −60 dBm ±0.1 dB.
7. If the marker reads less than −60.1 dBm, rotate A4R826 CAL OSC
AMPTD one-third turn counter-clockwise for every 0.1 dB less than
−60 dBm. See Figure 2a-2 for the location of A4R826.
8. If the marker reads greater than −59.9 dBm, rotate A4R826 CAL
OSC AMPTD one-third turn clockwise for every 0.1 dB greater than
−60 dBm. A change in the displayed amplitude will not be seen at
this point.
NOTE If A4R826 has inadequate range, refer to “Inadequate CAL OSC
AMPTD Range” in Chapter 9.
9. On the spectrum analyzer, press
ADJ CURR IF STATE. After allowing
the spectrum analyzer time to complete the adjustments, the
displayed amplitude and marker reading should change.